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2.5 liter 4 cylinder , or the 3.0 liter or 4.0 liter V6
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its a ford ranger motor, or it might be some other motor. And the FI stands for fuel injected.
For the 2.3 liter and the 3.0 liter engines ( 5W-20 ) For the 4.0 liter ( 5W-30 ) According to the Owner Guide
yes its the same engien
10w40 would be a good choice for this engine.
10w40
On a 1998 Ford Ranger : Both the 4.0 liter and the 3.0 liter V6 engines are an ( Over Head Valve ) design
The 4.0 liter SOHC ( 8th " character " of VIN is an " E " )
10w40 is a thicker oil than 5w30. I would only use 10w40 in an older motor in the summer, if the motor was using too much 10w30. The thinner oil will not have the higher pressure. Pressure that this motor needed.? I would go back to the 10w40 and see if the knocking stops...the damage may already be done.
it should say on the top of the motor in big print.
10w40